| abstract |
filter to filter particulate matter (pm) from the exhaust gas, discharge system for a compression ignition engine, compression ignition engine, and, methods to capture particulate matter (pm) from the exhaust gas and to adjust the back pressure of the filter in a compression ignition engine discharge system. a filter to filter particulate matter (mp) from exhaust gas emitted from a compressed ignition engine, which filter comprises a porous substrate that has inlet and outlet surfaces, in which the inlet surfaces are separated from the surfaces of exit through a porous structure containing pores of a first average pore size, in which the porous substrate is coated with a surface coating comprising a plurality of solid particles containing a molecular sieve promoted with at least one metal in which the porous structure of the washing coated porous substrate contains pores of a second average pore size, and where the second average pore size is smaller than the first average pore size. |